## Dependency Injection { #dependency-injection }

Using `BackgroundTasks` also works with the dependency injection system, you can declare a parameter of type `BackgroundTasks` at multiple levels: in a *path operation function*, in a dependency (dependable), in a sub-dependency, etc.

    <version>0.2</version>
    <packaging>pom</packaging>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.junit</groupId>
                <artifactId>junit</artifactId>
                <version>0.2</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

  <packaging>pom</packaging>
  <name>p1</name>
  <version>1.0</version>
  <scm>
    <url>scm-url</url>
  </scm>

  <dependencies>

    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t09-a</artifactId>
    </dependency>

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <artifactId>maven-antrun-plugin</artifactId>
        <configuration>

    <version>0.1</version>
    <packaging>pom</packaging>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.junit</groupId>
                <artifactId>junit</artifactId>
                <version>0.1</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <artifactId>parent</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  <artifactId>module-a</artifactId>

  <dependencies>
    <dependency>
      <groupId>cyclic-reference</groupId>
      <artifactId>module-b</artifactId>
      <version>1.0-SNAPSHOT</version>
    </dependency>
  </dependencies>

    <version>0.1-SNAPSHOT</version>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.junit</groupId>
                <artifactId>bom</artifactId>
                <version>0.1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <name>Maven Integration Test :: Dummy BOM</name>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.apache.maven.its</groupId>
                <artifactId>a</artifactId>
                <version>0.1</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

=============

If you use OkHttp as a dependency in an Android project which uses R8 as a default compiler you
don't have to do anything. The specific rules are [already bundled][okhttp3_pro] into the JAR which can be
interpreted by R8 automatically.

If you, however, don't use R8 you have to apply the rules from [this file][okhttp3_pro]. You might
also need rules from [Okio][okio] which is a dependency of this library.

import org.apache.maven.artifact.Artifact;
import org.eclipse.aether.graph.Dependency;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertNull;

class RepositoryUtilsTest {

    @Test
    void testToArtifactMethodsReturnNullWhenInputParameterIsNull() {
        assertNull(RepositoryUtils.toArtifact((Dependency) null));
        assertNull(RepositoryUtils.toArtifact((Artifact) null));

  <version>1</version>
  <packaging>pom</packaging>

  <name>Maven Integration Test :: MNG-3023</name>
  <description>Test that reactor projects are included in dependency resolution.</description>

  <modules>
    <module>dependency</module>
    <module>consumer</module>
  </modules>